Signaling system



Feb. 25, 1 930. E. F. CARTER 1,748,754

SIGNALING SYSTEM Filed Aug. 12, 1927 is K0 Inventor Emm ett E Carter 'HiS Attorney:

P tented Feb. 2s, 1930 v ,j

, EMMET'I F. CARTER,

Page; oFi Ic 7* or scflmecmm NEW YfonK,

SIGNALING SYSTEM Application filed. August 12, 1927'. Serial No. 212,579;

,My invention relates to signaling systems and more particularly, to' "calling systems usedfin connect on with telephone-comm t nication channels. a

In connection with highjfrequency; signaling systemssuch as those whichare employed forcommun catlon by means of carrier currents transmitted over the lines of the usual? power distribution {system it is generally gnecessary and desirable to locate: the high frequency transmitting and recei-ving equipment inproxiinity to-the power system and to extend therefrom telephone circuits leading to the; instruments of the different partiesto whomservice -is provided? Itilis necessary to employ for'callingpun poses, and the like, signaling-devices.assog l;

aTh'e usual telephone equipment which is (as- ,7,-

' 'ciated withthesefextensions and it is preferable that these devices be operatedfirom a -central sourcef-of energy. It is frequently desirable to operate these devices with energy'of; a different. form from that" available-at: the carrier station, and accordingly some:translating apparatus such as a rotary converter or motor generator-setis frequent-*- 1y employed \Vherej thisis done it-is uneco-f nomical to maintainthe translating'apparatus in continuous operation and accord,

ingly it is the. purpose of my; invention to provide means wherebyrit n'ay be automatie, "cally started in response to a call received at the carrier station, and connected to sup; ply energy to the line of the calledg party It ;is;:also the purpose of my invention to provide meanswhereby the line of the; called party; will be disconnected from the signal ing channel: while'the translating. apparatus is; connected thereto; vAfter the call has been completed:the'translating. apparatus will be automatically, disconnected from the energy source and from the line and restored to its;

normallyidleconditiont The novel featuresiwhich I believe to be characteristiciof my" invention are set forth with',particularity in the appended claims.

My invention itself, however,"both as to its organization and method, of operation toget-her'with further objects and advantages thereof may best beunderstood by reference I to the following description taken in con- 1 at the carrier station and accordingly means the output to the transmitter being 'eachcfon}; a nected through the transformer 3 to the high j' frequency signaling channel 4.; Likewise the output from the-receiver and the input to the transmitter are connected through trans former 5, to the signalingchannel- 6 This latter signaling. channel is, extended ,by

meansfofswitches '7', 8 overa plurality of,

linesl eadingzw the parties served and-which I are" represented in the drawing by lines sociated withueachjjof these lines; and whicl a rent-signaling-devicesuch as is used for, v calling purposesiis represented at 11;, 12 representsa-c'entral source of directycur-Q is provided with; the usual 'alternating cure rent energy such asis usually 'providedgat a of converting the direct current energy from the-source 13 ,into alternating: currentfor operatingthe bellsof the stations 11 v suitable translating apparatus is provided" 7 such as a motor generator set or rotary converter 14, the direct current circuitiofl hich may be connected throughaswitch.1 5 to the source of energy 1'8v and the alternating,

current circuit of which may be connectecr through anyof the-switches 7 8toia correspondingcircuit 9, 10. Far purposes of "economy. it is desirable that this converterf.

14 should be normally idle andshould be operated only in -response to a'cfall're are I provided whereby this converter 'is' caused to foperate in response "to operatiloii j of the selector switch which"is* associated" which isi connected incii cuit' with: the --coil l with thereceiving apparatus This ee the carrier'currentstation For thefpurposeflfi of one of the switches 7, 8 a source of po' tential 19 and the armature of the switch 16.

As thus arranged the operation of my device is as follows. If it be assumed that a call is received at the receiving equipment 1 corresponding to the party 11, the selector 16 will move its armature into engagement with the contact 18, thereby closing a circuit lead-.

.ing from the positive side of the source. of

potential 19 through the armature ofthe selector switch 16, contact 18, actuating coil of the switch 7 back to the negative side of the source of potential 19. Switch 7 will then actuate all of its armatures to the right. By 7 means of its central and right-hand contact telephone 11 will be disconnected from the signaling channel 6 and connected to the circuit 20 leading to the alternatlng current side of the converting apparatus. By means of its left-hand contact a circuit will be closed leading fromthe negative side of the battery 19 through conductor 21, left-hand contacts of theswitch 7, actuating coil of the switch '15 and conductor 22 back to the positive side of the source of potential 19. Switch will then close its contact to supply direct current energy to'the rotary converter 14:. This converter will then be caused to operate to supply alternating current energy through the circuit and central and left-hand contacts ofthe switch 7 to the signaling device of the equipment 11. This condition will be maintained until the selector switch 16 again returns to its normal position corresponding to that shown in the drawing. The telephone equipment 11 will then be again connected to the signaling channel 6 and switch 15 will open'its contact and thereby deenergize the converting apparatus stopping its operation until another call is received.

Similarly, if a call corresponding to station 12 is received the armature of switch 16 will engage contact 17 and switch 8 will respond causing operation of the converter as betore. While. I particularly mention the use of my invention in connection with systems where alternating current is used for signaling pur poses it will of course be understood that I contemplate its use where any energy translation between the energy source and signaling devices is required or in connectionwith the control of any normally inoperative energy source, to render it operative to supply current to the signaling devices.

VV'hile I have shown and described a single embodiment of my invention it is, of course, to be understood that I do not wish to be limited thereto since many modifications, both in the circuit arrangement andin the instru- 1 mentalities employed, may be made without departing from the spirit and scope of my invention as set forth in the appended claims.

What I claim as new, and desireto secure by Letters Patent ofthe United States is:

1. In combination, a signaling channel, a signaling device, a normally unoperated energy translating device, an energy source, and switching means operable responsively to currents in said channel to connect said translating device to said energy source and to said signaling device whereby said translating device is operated to supply energy to the signaling device.

2. In combinatioma signaling channel, a

device to operate to supply energy to a selected signaling device.

, 4. In combination, a signaling channel, a plurality of signaling devices, an energy source, an energy translating device, selecting means responsive to currents in said 'channelto connect said energy translating device to said source and to a selected signal ing device.

5. In combination, a signaling channel, a

plurality of signaling devices normally con- 'nected to said channel, an energy source, an energy translatlng devlce and selecting means operable responsively to currents in said channel to disconnect one of said signaling devices from said channel and to connect said energy translating device to said source and to said signaling device.

6. In combination, a signaling channel, a

signaling device normally connected to "said channel, a source of potential, a. normally unoperated energy translating device, means operable responsively to currents in said channel, means operable responsively thereto to disconnect said signaling device from said channel and to connect said-translatlng device to said signaling device, and means operable responsively to said last means for causing said translating device to operate to supply energy from said source to said signaling'device.

In witness whereof, I have'hereunto set my hand this 11th day of August, 1927.

' EMMETT F. CARTER. 7 

